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+/*
+ * Mesa 3-D graphics library
+ * Version:  6.1
+ *
+ * Copyright (C) 1999-2004  Brian Paul   All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ */
+
+/**
+ * \file swrast/swrast.h
+ * \brief Public interface to the software rasterization functions.
+ * \author Keith Whitwell <keith@tungstengraphics.com>
+ */
+
+#ifndef SWRAST_H
+#define SWRAST_H
+
+#include "mtypes.h"
+
+/**
+ * \struct SWvertex
+ * \brief Data-structure to handle vertices in the software rasterizer.
+ * 
+ * The software rasterizer now uses this format for vertices.  Thus a
+ * 'RasterSetup' stage or other translation is required between the
+ * tnl module and the swrast rasterization functions.  This serves to
+ * isolate the swrast module from the internals of the tnl module, and
+ * improve its usefulness as a fallback mechanism for hardware
+ * drivers.
+ *
+ * Full software drivers:
+ *   - Register the rastersetup and triangle functions from
+ *     utils/software_helper.
+ *   - On statechange, update the rasterization pointers in that module.
+ *
+ * Rasterization hardware drivers:
+ *   - Keep native rastersetup.
+ *   - Implement native twoside,offset and unfilled triangle setup.
+ *   - Implement a translator from native vertices to swrast vertices.
+ *   - On partial fallback (mix of accelerated and unaccelerated
+ *   prims), call a pass-through function which translates native
+ *   vertices to SWvertices and calls the appropriate swrast function.
+ *   - On total fallback (vertex format insufficient for state or all
+ *     primitives unaccelerated), hook in swrast_setup instead.
+ */
+typedef struct {
+   /** win[0], win[1] are the screen-coords of SWvertex. win[2] is the
+    * z-coord. what is win[3]? */
+   GLfloat win[4];
+   GLfloat texcoord[MAX_TEXTURE_COORD_UNITS][4];
+   GLchan color[4];
+   GLchan specular[4];
+   GLfloat fog;
+   GLfloat index;
+   GLfloat pointSize;
+} SWvertex;
+
+
+struct swrast_device_driver;
+
+
+/* These are the public-access functions exported from swrast.
+ */
+extern void
+_swrast_alloc_buffers( GLframebuffer *buffer );
+
+extern void
+_swrast_use_read_buffer( GLcontext *ctx );
+
+extern void
+_swrast_use_draw_buffer( GLcontext *ctx );
+
+extern GLboolean
+_swrast_CreateContext( GLcontext *ctx );
+
+extern void
+_swrast_DestroyContext( GLcontext *ctx );
+
+/* Get a (non-const) reference to the device driver struct for swrast.
+ */
+extern struct swrast_device_driver *
+_swrast_GetDeviceDriverReference( GLcontext *ctx );
+
+extern void
+_swrast_Bitmap( GLcontext *ctx,
+		GLint px, GLint py,
+		GLsizei width, GLsizei height,
+		const struct gl_pixelstore_attrib *unpack,
+		const GLubyte *bitmap );
+
+extern void
+_swrast_CopyPixels( GLcontext *ctx,
+		    GLint srcx, GLint srcy,
+		    GLint destx, GLint desty,
+		    GLsizei width, GLsizei height,
+		    GLenum type );
+
+extern void
+_swrast_DrawPixels( GLcontext *ctx,
+		    GLint x, GLint y,
+		    GLsizei width, GLsizei height,
+		    GLenum format, GLenum type,
+		    const struct gl_pixelstore_attrib *unpack,
+		    const GLvoid *pixels );
+
+extern void
+_swrast_ReadPixels( GLcontext *ctx,
+		    GLint x, GLint y, GLsizei width, GLsizei height,
+		    GLenum format, GLenum type,
+		    const struct gl_pixelstore_attrib *unpack,
+		    GLvoid *pixels );
+
+extern void
+_swrast_Clear( GLcontext *ctx, GLbitfield mask, GLboolean all,
+	       GLint x, GLint y, GLint width, GLint height );
+
+extern void
+_swrast_Accum( GLcontext *ctx, GLenum op,
+	       GLfloat value, GLint xpos, GLint ypos,
+	       GLint width, GLint height );
+
+
+extern void
+_swrast_DrawBuffer( GLcontext *ctx, GLenum mode );
+
+
+/* Reset the stipple counter
+ */
+extern void
+_swrast_ResetLineStipple( GLcontext *ctx );
+
+/* These will always render the correct point/line/triangle for the
+ * current state.
+ *
+ * For flatshaded primitives, the provoking vertex is the final one.
+ */
+extern void
+_swrast_Point( GLcontext *ctx, const SWvertex *v );
+
+extern void
+_swrast_Line( GLcontext *ctx, const SWvertex *v0, const SWvertex *v1 );
+
+extern void
+_swrast_Triangle( GLcontext *ctx, const SWvertex *v0,
+                  const SWvertex *v1, const SWvertex *v2 );
+
+extern void
+_swrast_Quad( GLcontext *ctx,
+              const SWvertex *v0, const SWvertex *v1,
+	      const SWvertex *v2,  const SWvertex *v3);
+
+extern void
+_swrast_flush( GLcontext *ctx );
+
+extern void
+_swrast_render_primitive( GLcontext *ctx, GLenum mode );
+
+extern void
+_swrast_render_start( GLcontext *ctx );
+
+extern void
+_swrast_render_finish( GLcontext *ctx );
+
+/* Tell the software rasterizer about core state changes.
+ */
+extern void
+_swrast_InvalidateState( GLcontext *ctx, GLuint new_state );
+
+/* Configure software rasterizer to match hardware rasterizer characteristics:
+ */
+extern void
+_swrast_allow_vertex_fog( GLcontext *ctx, GLboolean value );
+
+extern void
+_swrast_allow_pixel_fog( GLcontext *ctx, GLboolean value );
+
+/* Debug:
+ */
+extern void
+_swrast_print_vertex( GLcontext *ctx, const SWvertex *v );
+
+
+extern GLvoid *
+_swrast_validate_pbo_access(const struct gl_pixelstore_attrib *pack,
+                            GLsizei width, GLsizei height, GLsizei depth,
+                            GLenum format, GLenum type, GLvoid *ptr);
+
+/*
+ * Imaging fallbacks (a better solution should be found, perhaps
+ * moving all the imaging fallback code to a new module) 
+ */
+extern void
+_swrast_CopyConvolutionFilter2D(GLcontext *ctx, GLenum target, 
+				GLenum internalFormat, 
+				GLint x, GLint y, GLsizei width, 
+				GLsizei height);
+extern void
+_swrast_CopyConvolutionFilter1D(GLcontext *ctx, GLenum target, 
+				GLenum internalFormat, 
+				GLint x, GLint y, GLsizei width);
+extern void
+_swrast_CopyColorSubTable( GLcontext *ctx,GLenum target, GLsizei start,
+			   GLint x, GLint y, GLsizei width);
+extern void
+_swrast_CopyColorTable( GLcontext *ctx, 
+			GLenum target, GLenum internalformat,
+			GLint x, GLint y, GLsizei width);
+
+
+/*
+ * Texture fallbacks.  Could also live in a new module
+ * with the rest of the texture store fallbacks?
+ */
+extern void
+_swrast_copy_teximage1d(GLcontext *ctx, GLenum target, GLint level,
+                        GLenum internalFormat,
+                        GLint x, GLint y, GLsizei width, GLint border);
+
+extern void
+_swrast_copy_teximage2d(GLcontext *ctx, GLenum target, GLint level,
+                        GLenum internalFormat,
+                        GLint x, GLint y, GLsizei width, GLsizei height,
+                        GLint border);
+
+
+extern void
+_swrast_copy_texsubimage1d(GLcontext *ctx, GLenum target, GLint level,
+                           GLint xoffset, GLint x, GLint y, GLsizei width);
+
+extern void
+_swrast_copy_texsubimage2d(GLcontext *ctx,
+                           GLenum target, GLint level,
+                           GLint xoffset, GLint yoffset,
+                           GLint x, GLint y, GLsizei width, GLsizei height);
+
+extern void
+_swrast_copy_texsubimage3d(GLcontext *ctx,
+                           GLenum target, GLint level,
+                           GLint xoffset, GLint yoffset, GLint zoffset,
+                           GLint x, GLint y, GLsizei width, GLsizei height);
+
+
+/* The driver interface for the software rasterizer.
+ * Unless otherwise noted, all functions are mandatory.  
+ */
+struct swrast_device_driver {
+
+   void (*SetBuffer)(GLcontext *ctx, GLframebuffer *buffer, GLuint bufferBit);
+   /*
+    * Specifies the current color buffer for span/pixel writing/reading.
+    * buffer indicates which window to write to / read from.  Normally,
+    * this'll be the buffer currently bound to the context, but it doesn't
+    * have to be!
+    * bufferBit indicates which color buffer, exactly one of:
+    *    DD_FRONT_LEFT_BIT - this buffer always exists
+    *    DD_BACK_LEFT_BIT - when double buffering
+    *    DD_FRONT_RIGHT_BIT - when using stereo
+    *    DD_BACK_RIGHT_BIT - when using stereo and double buffering
+    *    DD_AUXn_BIT - if aux buffers are implemented
+    */
+
+
+   /***
+    *** Functions for synchronizing access to the framebuffer:
+    ***/
+
+   void (*SpanRenderStart)(GLcontext *ctx);
+   void (*SpanRenderFinish)(GLcontext *ctx);
+   /* OPTIONAL.
+    *
+    * Called before and after all rendering operations, including DrawPixels,
+    * ReadPixels, Bitmap, span functions, and CopyTexImage, etc commands.
+    * These are a suitable place for grabbing/releasing hardware locks.
+    *
+    * NOTE: The swrast triangle/line/point routines *DO NOT* call
+    * these functions.  Locking in that case must be organized by the
+    * driver by other mechanisms.
+    */
+
+   /***
+    *** Functions for writing pixels to the frame buffer:
+    ***/
+
+   void (*WriteRGBASpan)( const GLcontext *ctx,
+                          GLuint n, GLint x, GLint y,
+                          CONST GLchan rgba[][4], const GLubyte mask[] );
+   void (*WriteRGBSpan)( const GLcontext *ctx,
+                         GLuint n, GLint x, GLint y,
+                         CONST GLchan rgb[][3], const GLubyte mask[] );
+   /* Write a horizontal run of RGBA or RGB pixels.
+    * If mask is NULL, draw all pixels.
+    * If mask is not null, only draw pixel [i] when mask [i] is true.
+    */
+
+   void (*WriteMonoRGBASpan)( const GLcontext *ctx, GLuint n, GLint x, GLint y,
+                              const GLchan color[4], const GLubyte mask[] );
+   /* Write a horizontal run of RGBA pixels all with the same color.
+    * If mask is NULL, draw all pixels.
+    * If mask is not null, only draw pixel [i] when mask [i] is true.
+    */
+
+   void (*WriteRGBAPixels)( const GLcontext *ctx,
+                            GLuint n, const GLint x[], const GLint y[],
+                            CONST GLchan rgba[][4], const GLubyte mask[] );
+   /* Write array of RGBA pixels at random locations.
+    */
+
+   void (*WriteMonoRGBAPixels)( const GLcontext *ctx,
+                                GLuint n, const GLint x[], const GLint y[],
+                                const GLchan color[4], const GLubyte mask[] );
+   /* Write an array of mono-RGBA pixels at random locations.
+    */
+
+   void (*WriteCI32Span)( const GLcontext *ctx, GLuint n, GLint x, GLint y,
+                          const GLuint index[], const GLubyte mask[] );
+   void (*WriteCI8Span)( const GLcontext *ctx, GLuint n, GLint x, GLint y,
+                         const GLubyte index[], const GLubyte mask[] );
+   /* Write a horizontal run of CI pixels.  One function is for 32bpp
+    * indexes and the other for 8bpp pixels (the common case).  You mus
+    * implement both for color index mode.
+    * If mask is NULL, draw all pixels.
+    * If mask is not null, only draw pixel [i] when mask [i] is true.
+    */
+
+   void (*WriteMonoCISpan)( const GLcontext *ctx, GLuint n, GLint x, GLint y,
+                            GLuint colorIndex, const GLubyte mask[] );
+   /* Write a horizontal run of color index pixels using the color index
+    * last specified by the Index() function.
+    * If mask is NULL, draw all pixels.
+    * If mask is not null, only draw pixel [i] when mask [i] is true.
+    */
+
+   void (*WriteCI32Pixels)( const GLcontext *ctx,
+                            GLuint n, const GLint x[], const GLint y[],
+                            const GLuint index[], const GLubyte mask[] );
+   /*
+    * Write a random array of CI pixels.
+    */
+
+   void (*WriteMonoCIPixels)( const GLcontext *ctx,
+                              GLuint n, const GLint x[], const GLint y[],
+                              GLuint colorIndex, const GLubyte mask[] );
+   /* Write a random array of color index pixels using the color index
+    * last specified by the Index() function.
+    */
+
+
+   /***
+    *** Functions to read pixels from frame buffer:
+    ***/
+
+   void (*ReadCI32Span)( const GLcontext *ctx,
+                         GLuint n, GLint x, GLint y, GLuint index[] );
+   /* Read a horizontal run of color index pixels.
+    */
+
+   void (*ReadRGBASpan)( const GLcontext *ctx, GLuint n, GLint x, GLint y,
+                         GLchan rgba[][4] );
+   /* Read a horizontal run of RGBA pixels.
+    */
+
+   void (*ReadCI32Pixels)( const GLcontext *ctx,
+                           GLuint n, const GLint x[], const GLint y[],
+                           GLuint indx[], const GLubyte mask[] );
+   /* Read a random array of CI pixels.
+    */
+
+   void (*ReadRGBAPixels)( const GLcontext *ctx,
+                           GLuint n, const GLint x[], const GLint y[],
+                           GLchan rgba[][4], const GLubyte mask[] );
+   /* Read a random array of RGBA pixels.
+    */
+
+
+
+   /***
+    *** For supporting hardware Z buffers:
+    *** Either ALL or NONE of these functions must be implemented!
+    *** NOTE that Each depth value is a 32-bit GLuint.  If the depth
+    *** buffer is less than 32 bits deep then the extra upperbits are zero.
+    ***/
+
+   void (*WriteDepthSpan)( GLcontext *ctx, GLuint n, GLint x, GLint y,
+                           const GLdepth depth[], const GLubyte mask[] );
+   /* Write a horizontal span of values into the depth buffer.  Only write
+    * depth[i] value if mask[i] is nonzero.
+    */
+
+   void (*WriteMonoDepthSpan)( GLcontext *ctx, GLuint n, GLint x, GLint y,
+                               const GLdepth depth, const GLubyte mask[] );
+   /* Write a horizontal run of depth values.
+    * If mask is NULL, draw all pixels.
+    * If mask is not null, only draw pixel [i] when mask [i] is true.
+    */
+
+   void (*ReadDepthSpan)( GLcontext *ctx, GLuint n, GLint x, GLint y,
+                          GLdepth depth[] );
+   /* Read a horizontal span of values from the depth buffer.
+    */
+
+
+   void (*WriteDepthPixels)( GLcontext *ctx, GLuint n,
+                             const GLint x[], const GLint y[],
+                             const GLdepth depth[], const GLubyte mask[] );
+   /* Write an array of randomly positioned depth values into the
+    * depth buffer.  Only write depth[i] value if mask[i] is nonzero.
+    */
+
+   void (*ReadDepthPixels)( GLcontext *ctx, GLuint n,
+                            const GLint x[], const GLint y[],
+                            GLdepth depth[] );
+   /* Read an array of randomly positioned depth values from the depth buffer.
+    */
+
+
+
+   /***
+    *** For supporting hardware stencil buffers:
+    *** Either ALL or NONE of these functions must be implemented!
+    ***/
+
+   void (*WriteStencilSpan)( GLcontext *ctx, GLuint n, GLint x, GLint y,
+                             const GLstencil stencil[], const GLubyte mask[] );
+   /* Write a horizontal span of stencil values into the stencil buffer.
+    * If mask is NULL, write all stencil values.
+    * Else, only write stencil[i] if mask[i] is non-zero.
+    */
+
+   void (*ReadStencilSpan)( GLcontext *ctx, GLuint n, GLint x, GLint y,
+                            GLstencil stencil[] );
+   /* Read a horizontal span of stencil values from the stencil buffer.
+    */
+
+   void (*WriteStencilPixels)( GLcontext *ctx, GLuint n,
+                               const GLint x[], const GLint y[],
+                               const GLstencil stencil[],
+                               const GLubyte mask[] );
+   /* Write an array of stencil values into the stencil buffer.
+    * If mask is NULL, write all stencil values.
+    * Else, only write stencil[i] if mask[i] is non-zero.
+    */
+
+   void (*ReadStencilPixels)( GLcontext *ctx, GLuint n,
+                              const GLint x[], const GLint y[],
+                              GLstencil stencil[] );
+   /* Read an array of stencil values from the stencil buffer.
+    */
+};
+
+
+
+#endif